/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.service.basic;

import org.apache.iotdb.commons.concurrent.IoTDBThreadPoolFactory;
import org.apache.iotdb.commons.concurrent.threadpool.ScheduledExecutorUtil;
import org.apache.iotdb.db.conf.IoTDBConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class QueryFrequencyRecorder {

    private static final Logger QUERY_FREQUENCY_LOGGER = LoggerFactory.getLogger("QUERY_FREQUENCY");
    private static final AtomicInteger QUERY_COUNT = new AtomicInteger(0);

    public QueryFrequencyRecorder(IoTDBConfig config) {
        ScheduledExecutorService timedQuerySqlCountThread =
                IoTDBThreadPoolFactory.newSingleThreadScheduledExecutor("timedQuerySqlCount");
        ScheduledExecutorUtil.safelyScheduleAtFixedRate(
                timedQuerySqlCountThread,
                () -> {
                    if (QUERY_COUNT.get() != 0) {
                        QUERY_FREQUENCY_LOGGER.info(
                                "Query count in current 1 minute {} ", QUERY_COUNT.getAndSet(0));
                    }
                },
                config.getFrequencyIntervalInMinute(),
                config.getFrequencyIntervalInMinute(),
                TimeUnit.MINUTES);
    }

    public void incrementAndGet() {
        QUERY_COUNT.incrementAndGet();
    }
}
